Got this from searching the net:
Comments: Unfortunately, the various texts accompanying these
images on their odyssey from inbox to inbox over the past several
years haven't included enough information to verify whether the
wound shown was indeed caused by the bite of a brown recluse
("fiddleback") spider. The origin of the photos is unknown.
The wound itself appears to be real, at least, and, while more
extreme than most, does resemble necrotic ulcers known to be
symptomatic of brown recluse spider bites. However, they are also
symptomatic of gangrene and necrotizing fasciitis, both of which
can result from a brown recluse bite but both of which have other
causes as well, and can easily be mistaken for such a bite.
Experts say misdiagnoses very common. The majority of brown recluse
bites are "uneventful," in fact, and never progress to such a
serious stage.
http://urbanlegends.about.com/library/bl_brown_recluse_bite6.htm
